Improvement in head-blocks



THOMAS DouGLAss. Improvement n' Head Blocks.

Patented Jan. 30,1872.

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Improvement in Head Blocks; e N0, 123,091. Patented1an.30,1872. Y

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UNITED STATEs THOMAS DOUGLASS, OF `WARREN, OHIO.

IMPROVEMENT IN HEAD-BLOCKS.

Specification forming part o1 Letters Patent No. 123,091, dated January 30, 1872.

To all whom it may concern:

Be it known that I, THOMAS DoUGLAss, of Warren, in the county of Trumbull and State of Ohio, have invented a certain new and Iniproved Log-Set; and I do hereby declare that the following is a full, clear, and complete description thereof, reference being had to the accompanying drawing making part of the same. l

SPECIFICATION.

Figure 1 is a side elevation of the log-set. Fig. 2 is a view of the opposite side of Fig. 1. Fig. 3 is a front view. Fig. 4 is a plan view. Figs. 5 and 6 are detached sections.

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to a logset for saw-mills; and the object thereof is to adjust the log to the saw for cutting therefrom each successive board of an exact thickness, or, if required, so that one end of the board shall be thicker than the other, and at the same time Inove both ends of the log at once toward the saw and at any distance needful Y for the thickness of the board.

The following` is a full and complete descrip tion:

In Fig. 4, A represents 'a bedplate, in and on which is arranged the log-setting device, consisting in part of two horizontal shafts, B O, having their bearings in seats D on the top of the bed-plate. Said shafts are so arranged in rela-tion to each other as to have a common axial line. On the inner end of the shaft O is secured a ratchet-wheel, E, Fig. l, into the hub of which projects the inner end of the shaft B, which is fitted closely therein, but not tight. To one side of the wheel E is secured a section, a, of a clutch, G, consisting of the parts c b,- whereas the corresponding part b is loosely fitted to the shaft B so as to slide thereon, and

` which is made to rotate therewith by a feather.

By this means= the two shafts B C can be locked to each other, and made to revolve together or independently of each other by shifting the part b of the clutch into connection with the part a, or disengagin g it therefrom, as the case may be, by the lever H, Fig. 4, operated by the cam I of the handle J, for a purpose presently shown. On the shaft C, and close to the ratchet-wheel E,lis loosely fitted a handle, K, Figs. l and 5, to which is pivoted a pawl, L, whereby the ratchet-wheel is rotated. At the lower end ofthe handle K projects an arm, M, Fig. 5. Said arm is made to operate a slide, N, attached to the under side of the bed-plate, as shown in Fig. 5, by inea-ns of screws c passing through slots in the slide into the bottom of the bed-plate. On the upper side of said slide is a pair'of lugs, O, between which the end of the arm M rests, as shown in Fig. 5, when the handle K is in the position shown inthe drawing. Near to and in front of said pair of lugs is a single lug, P, over the side of which the arm d of the drop A' slides and is elevated, asv indicated by the dotted lines c, thereby partially rotating the shaft B', Figs. 3 and 4, to which said drop is secured. 'lhe purpose of thus rotating the shaft is to disengage the several pawls C', Figs. 3 and 4, from the ratchet-wheel D', and which it does by lifting or throwing back thc pawls therefrom by an arm, indicated by th dotted line f, projectingfrom the shaftgwhich, when the shaft is turned, lifts or throws the pawls back from the wheel, for a purpose presently shown. The ratchetwheel D' referred to is secured to the shaft B, and rotates the saine by the following device, viz.: On the outer side of the wheel D' is constructed a shoulder, by casting thereon a continuous flange, E', Fig. 6, which is of less diameter than the wheel. To said iiange or shoulder is fitted, closely but not tightly, a ring, F'. The two ends G' H' of said ring project upward above the wheel, and are there secured to each other, some distance apart, by yokes J'. The ring thus fitted to the iiange of the wheel is close-fitting, but not tight; hence it is easily turned thereon. Between the two upright ends of the ring is pivoted, in the lower yoke, a lever, K', the long arm of which extends upward to the height and parallel with the endV H' of the ring, as shown in Fig. 1; whereas the short arm of the lever reaches down and rests upon the face of the iiange or shoulder E' of the wheel, as shown in Fig. 6, in which it will be seen that one corner of the lower end of the lever is rounded, and therefore not in contact with the iiange, whereas the opposite corner is pointed and is in contact with the face of the iiange. I'., Figs. 2 and 3, is a slotted seg ment, in the slot of which is a stop, M', se-

cured therein by a finger-screw, N'. On the periphery of the segment is a scale of feet, o';

a l 123,091A

so also on the periphery of the two sections of the clutch Gis a scale of numbers, the purposes of which will hereinafter be shown. l, Fig. l, is a segment. Said segment is con-v nected to the segment L by a bar, M, Fig. 3, from the inside of which bar projects a finger, N, Fig. 5, directly over the ratchet-wheel E. The purpose of said linger is to throw the pawl L from its engagement with the teeth of the wheel when the handle K is thrown back sufficiently to bring the pawl against the end` of the finger, the object of which will pres,- ently be shown.

Having described the construction and arrangement of the log-set, the practical operation of the same is as follows:

This log-set is intended to be used inconnection with a circular saw, and its position in relation thereto is such as to present the side Fig. 4, toward the face of the saw, thereby bringing the shafts B O also in line with it. The shafts referred to are extended on either side to a dogging device arranged at right angles therewith upon sills, and to which device the shafts are connected by gearing, which is so arranged as to be operated by the set to or away from the saw, for adjusting the log to the saw for each successive board cut therefrom, and which dogging device in part constitutes the carriage on which the log is secured and fed along to the saw while being cut. As the two shafts are each alike connected to a dogging device, which are similar in construction and operation, for holding each end of the log, it will be obvious therefore that both ends of the log must be moved at once toward the saw, and if the ends of the board are to be of equal thickness then the ends of the log must be equally distant from the plane of the saw, and moved accordingly for that purpose. And this is accomplished by so adjusting the movable section b of the clutch G that the figures thereon shall correspond with those on section a-that is to say, when the two sections of the clutch are locked together, as shown in Fig. 3, the iigures on the two sections must be directly opposite each other; thus figure l on the two sections must be side by side. This will bring the two dogging devices to which the set is connected equally distant from a line drawn through the horizontal diameter of the saw. YThe log is now moved toward the saw by operating the ratchet-wheel Dl, which is done by grasping the eX- tended arm H of the rin g. F, together with the handle of the lever K, by pressing the the twotogether, and pushing them in the direction of the arrow.' The two shafts, in consequence of their being connected to each other by the clutch, will be turned together and in the same direction, thereby operating' the two dogging devices, (which, as above said, are also the pillow on which the ends of the log` are supported,) which will set the log nearer the saw, more or less, as the thickness of the board to be sawn may require. Thus, should the board be one inch, then the set is moved that distance, which is determined by the fig ures on the periphery of the segment L.A The figures thereon, as Will be seen, count back from the side as shown in Fig. 4. The movable stop M is so adjusted in the slot of the segment as to allow the pointer R to stop on the line immediately above the figure l on pulling the lever and handle back. The distance fronisaid lever to the line below the ligure is one inch, and at which the pointer will stopby the handle falling upon the stationary check or stop R. This movement of the set will adjust the log one inch nearer to the saw, the thickness required for the board. Should a thicker board be required say two inches thickthen the movable stop N is adjusted back to the 1i gure 2, or in such relation thereto as to allow the pointer to stopon the line of the figure 2. Now, on pushn g the handle forward as before, the set will move two inches, thereby moving the log the same distance, and so on through the whole range of igures. In the event it becomes necessary to move the log back from the saw, it is done by the ratchetwheel E operated by the pawl L and handle K. On pulling said handle in the direction of the arrow shown in Fig. 5, the slide N will be moved forward, as indicated by the dotted line a, by means of the arm M of the handle. This movement of the slide will throw up the drop A and lift the pawls C from their engagement of the wheel D to rotate and thus produce a reverse movement of the log-set, thereby moving back the log from the saw, but which may again be moved forward by pushing the handle K to the position shown in Fig. 5. The pawl L by this movement will be disengaged from the wheel E by its being pushed therefrom by the iinger N, and the series of pawls C will fall again upon the wheel D, in consequence of the slide being moved back by the arm M of the handle K, so that the set can be operated for adjusting the log nearer to the saw, as aforesaid, by the lever K, the operation of which on the flange E of the wheel D is as follows: As above said, one corner of the lower end of the lever is pointed and in contact with the face of the liange. Now, on forcing` the pointed corner upon the face of the liange, by pressing the upper end of the lever toward the extended end H of the ring, holding both in` the hand, said ring will be prevented from slipping around on the flange, and therefore will rotate the wheel in one direction on pushing the lever in the direction of the arrow shown in Figs. l and 2, but which is prevented from a reaction by the pawls on pulling back the lever, and which pulling is done by drawing on the extended end H of the ring, only, without pressing' on the lever. Hence, to operate the wheel D for moving the log toward the saw, the lever K and the extended end H of thev ring are both grasped by the hand and pressed together, at the same time pushing them forward, whereas the reverse movement is effected by releasing the lever and simply pulling back by the end H. In order to saw one end ofthe boards thicker than the others, one end of the log must be moved toward the saw in advance of the other. For this purpose the two shafts B C are disconnected by means of the clutch G, which may be done by pushing the handle of the cam I in direction ofthe dotted line m, Fig. 4, thereby disconnecting the tWo sections of the clutch, liberating the shaft G from B. Should the difference in the thickness of the ends of the boards be required to be one inch, then the two sections of the clutch are turned so as to bring the iigures 1 and 2 side by side. This will bring one end of the log one inch nearer to the saw than the other. y The clutch, on being locked together in this relation of the iigures on each part, is then operated in the same Way for adjusting it to the saw as above described. In the event a greater difference is required in the thickness of the boardsay two inches or 'more-the gures on the two parts of the clutch are ranged in such relation as three to one, four to one, Snc., as the difference desired may be.` The distance from igure to figure being equal to one inch will, as a consequence, adjust the log at that distance.

I do not claim a frictional detent consisting of a Wheel having an expansion ring on the inside thereof, and operated by a cam, as described and set forth in the patent to William M. Ferry, April 18, 1871, and referred to in the oiicial letter of December 16, 1871, relatin g thereto; but What I claim as my invention, and desire to secure by Letters Patent, is-

Cla/im.

1. The ring F', lever K, dange E', and ratchet-Wheel D', all constructed and arranged to operate in the manner as and for the purpose speciiied.

2. The shaft B, section b of the clutch G, ratchet-Wheel D', flange E', ring F', in combination with the shaft C, ratchet-Wheel E, and section a ofthe clutch, in the manner and substantially as described, and for the purpose set forth.

3. The slide N, as arranged in combination With the arm M of the handle K, drop Af, and shaft Bl for operating the pawls C', for the purpose specified.

4. The shifting-lever H and cam I of the handle J, in combination with the clutch Gr, for the purpose specified.

THOMAS DOUGLASS.

Witnesses: i

W. H. BURRIDGE, W. S. DOUGLASS. 

